## Search found 9 matches

can't one just calculate p(BBB) = P(B1*P(B2)*P(B3) = 1/2 * 1/2 * 1/2 = 1/8

p(GGG) = P(G1)*P(G2)*P(G3) = 1/2 * 1/2 * 1/2 = 1/8

p(BBB)+ p(GGG)= 1/8 + 1/8 = 1/4

anything wrong with this straightforward approach?

- by oldguy

Mon Apr 04, 2011 6:47 am- Forum: Problem Solving
- Topic: Probability
- Replies:
**35** - Views:
**21009**

- by oldguy

Tue Mar 22, 2011 6:57 am- Forum: Critical Reasoning
- Topic: undermines the conclusion
- Replies:
**110** - Views:
**40731**

i eliminated a,d,e and then guessed c instead of b. is c correct?

this is one of those questions to think about for one minute and then answer and move on!

- by oldguy

Mon Mar 21, 2011 8:46 am- Forum: Critical Reasoning
- Topic: Oak trees
- Replies:
**88** - Views:
**36498**

- by oldguy

Sun Mar 20, 2011 5:07 pm- Forum: Sentence Correction
- Topic: Speed limit - long one!
- Replies:
**282** - Views:
**97715**

so why can the answer not be that 1,000 red chips were picked and one purple? 1,000 * 11 = 11,000 8 * 1 = 8 11,000 * 8 = 88,000. then the answer would be a. (1 purple chip. ) the question does not limit the number of chips drawn. or pick two purple chips 8*8 = 64. 125 red chips is 11*125= 1,375. 64*...

- by oldguy

Sun Mar 20, 2011 9:14 am- Forum: Problem Solving
- Topic: More Primes
- Replies:
**93** - Views:
**40844**

A.

the article mentions b,c,d,e. so A. long passage. more questions on it ? (now that we have all read it). thanks.

- by oldguy

Fri Mar 18, 2011 7:10 am- Forum: Reading Comprehension
- Topic: Apes are our friends
- Replies:
**69** - Views:
**37743**

d. we know it is 12/h. where h < 15 and 18. so answers a,b,e are out. leaves c and d . c < 1 so not likely. answer is then d. or do the math. which i see on the other answers. my answer is done in 15 seconds. the math takes just 45 seconds or so. one should do the math to be sure on a question like ...

- by oldguy

Thu Mar 17, 2011 12:41 pm- Forum: Problem Solving
- Topic: og math # 130
- Replies:
**132** - Views:
**51338**

- by oldguy

Thu Mar 17, 2011 12:02 pm- Forum: Sentence Correction
- Topic: Spicy
- Replies:
**151** - Views:
**63542**

- by oldguy

Wed Mar 16, 2011 11:48 am- Forum: Sentence Correction
- Topic: Speed limit - long one!
- Replies:
**282** - Views:
**97715**